But a clutch bogey putt there came before a blistering birdie-eagle-birdie-birdie run from the 14th to seal a three-shot win over fellow American Matt Kuchar on 12 under.

And it means the 23 year old is picking off Majors at a rate faster than Tiger Woods as he is now just the second person after Jack Nicklaus to win three legs of the career Grand Slam before the age of 24.

Prior to that bogeys on the first, third and and fourth came before a birdie on the fifth and another dropped shot on the ninth.

But he regrouped with help from his caddie Michael Greller and now he goes to next month's US PGA Championship looking to become just the sixth player in history to have won all four Majors.

Spieth said: "My last goal now is to try and complete a career Grand Slam. This is a very special tournament. I’ve had one wrapped up and didn’t quite close and those thoughts start to come into your head."